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These are open drains provided for conveying water from kitchens, bathroom and rain water to main sewers.(a) Drains(b) Sewers(c) Soak pit(d) Surface drainsThe question was posed to me in an interview.Origin of the question is Principle for the Preparation of Water Supply topic in portion Valuation, Reports Technical and Design Data of Civil Engineering Drawing

Answer»

Right option is (d) Surface drains

The explanation is: These are usually provided at the side of the road and along the boundary line of the building. As far as possible drains should not be laid under the buildings. For EFFICIENT draining the surfacedrains should have certain qualities, such as should be laid in such a gradient to develop self -cleaning velocity, should have a reasonable FREE board at the top, joint should be SMOOTH finished, easy CURVES, INNER surface should be smooth, cheap in construction and maintenance.



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